"Rock wool is available in rigid product, with various densities, depending on application.
There is a product designed as drain board for foundations.
It's available in pipe insulation, batts, and blown in. Although you may have a hard time…"
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George J. Nesbitt
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George J. Nesbitt's Discussions
Duct Testing High Velocity Systems
2 Replies
Dose anyone have experience testing high velocity duct systems?I've been asked to duct test a Zhender HRV with comfoducts (2" homerun ducts).I designed & installed a hydronic high velocity system…Continue
Started this discussion. Last reply by Paul Morin Jan 10.
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George J. Nesbitt replied to Jack Baikoff's discussion Measuring fresh air intake ducted to a return and no way of measuring from outside."That duct is an economizer. It's purpose is ventilation, and possibly cooling (rather than using the AC). Night time cooling works great in the western states in many places, where it's dry, and the temperatures drop at night to below…"
George J. Nesbitt replied to Mike Kandel's discussion January's Stump the Chump"Could it be that the attic is connected to other units that did not receive air sealing & insulation. So the heat loss from those units still melt ice."
George J. Nesbitt replied to Jack Baikoff's discussion Measuring fresh air intake ducted to a return and no way of measuring from outside."Not inexpensive!
Do you install it and leave it, or do you drill a hole, and have to patch?"
George J. Nesbitt commented on Christopher Morin's blog post Oil Tanks in Your Home"I have a client here on the left (west) coast that had a house sale fall through recently on the right (east) coast due to the oil tank. The buyer was from the left, and not used to them. I don't know if there is any evidence of an actual…"
George J. Nesbitt replied to Dennis McCarthy's discussion Would you like a lighting audit with your energy audit ?"I've always included lighting and appliances (pools & spas too) in my "audits". I've always assumed they were part of the "house".
But sadly our industry tends to focus on the HVAC, air sealing & insulation.
But…"
George J. Nesbitt replied to Dennis McCarthy's discussion Would you like a lighting audit with your energy audit ?George J. Nesbitt replied to George Kopf's discussion ASHRAE 62.2.2010 and the $20 app"I thought somewhere I saw mention that the 62.2 2010 standard was available for free from ASHRAE, but don't seem to be able to find it. I can find some supplements for free, but they are incomplete.
Can anyone point me to a free or cheap…"
George J. Nesbitt replied to Jack Baikoff's discussion Measuring fresh air intake ducted to a return and no way of measuring from outside."I've use my energy conservatory exhaust flow pan (on the intake grill), flow hoods can work too."
George J. Nesbitt replied to George Kopf's discussion ASHRAE 62.2.2010 and the $20 app"George,
I'll sell you my ASHRAE 62.2 2010 excel spreadsheet for $20!
I think 62.2 is fairly easy.
What we have to remember that it's a minimum standard, based on an assumed "natural ventilation" (leakage rate) of 0.15 achnat.
I…"
Paul Morin replied to George J. Nesbitt's discussion Duct Testing High Velocity Systems"if the duct leakage is relatively low, 200 cfm or less, the pressure in the duct system will be quite uniform and either location will give consistent results. If the duct leakage is high, over 500 cfm, we recommend that you do two…"
George J. Nesbitt replied to George Whiting's discussion Retrofit insulation on the roof over cathedral ceiling"Insulating above the roof deck is the way to go in this case. I am completing a simular project on my house currently.
Remove the shingles, drill & fill the existing cavities with dense pack cellulose (3.5# cuft) or fiberglass. Air seal the…"
George J. Nesbitt's discussion was featuredDuct Testing High Velocity Systems
Dose anyone have experience testing high velocity duct systems?I've been asked to duct test a Zhender HRV with comfoducts (2" homerun ducts).I designed & installed a hydronic high velocity system a few years ago. It had 25' of 12" return flex duct, and 15-20' of 6+8" sheet metal ducting, 2 + 2-1/2" branch ducting. I sealed everything with mastic.I installed the duct tester at the return, and the duct pressure at the nearest supply to the air hander, as I would on a low velocity system. I…See More
Colin Genge replied to George J. Nesbitt's discussion Duct Testing High Velocity Systems"This duct system should be tight enough that it should not matter where you test it from. I recommend you test under negative pressure to ensure you get good seals at the registers. How high was your reading and what flow range were you…"
George J. Nesbitt replied to Patrick Michaelyan's discussion Mold Growth & Draftiness Post Energy Improvements"Bud is correct
Because of the air sealing & insulation the RH in the house has increased, and now the 1 wall & some windows are cold enough that condensation happens, and mold grows.
It's important to understand that air leakage (in the…"
George J. Nesbitt posted a discussionDuct Testing High Velocity Systems
Dose anyone have experience testing high velocity duct systems?I've been asked to duct test a Zhender HRV with comfoducts (2" homerun ducts).I designed & installed a hydronic high velocity system a few years ago. It had 25' of 12" return flex duct, and 15-20' of 6+8" sheet metal ducting, 2 + 2-1/2" branch ducting. I sealed everything with mastic.I installed the duct tester at the return, and the duct pressure at the nearest supply to the air hander, as I would on a low velocity system. I…See More
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- At 6:02am on December 16, 2012,
Diane Chojnowski said… Hi George,
Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for you!
Don't forget to upload your profile photo. And add your location on our Member Map!
Thanks!
Diane, HEP Moderator
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